If f(0) = acos(be) +1, where a > 0 and b>0, then a true statement is Select one: a. -a +1≤0 ≤a+1 b. c. d. -a +1≤ f(0) ≤a+1 -1 ≤ f(0) ≤1 -1≤a≤1

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